﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System.Windows.Controls.Primitives;
using System.Collections;

namespace LiveEduWizard
{
    public partial class App : Application
    {
        public class QuitException : Exception
        {
        }

        private static MainViewModel viewModel = null;

        /// <summary>
        /// A static ViewModel used by the views to bind against.
        /// </summary>
        /// <returns>The MainViewModel object.</returns>
        public static MainViewModel ViewModel
        {
            get
            {
                // Delay creation of the view model until necessary
                if (viewModel == null)
                    viewModel = new MainViewModel();

                return viewModel;
            }
        }

        /// <summary>
        /// Provides easy access to the root frame of the Phone Application.
        /// </summary>
        /// <returns>The root frame of the Phone Application.</returns>
        public TransitionFrame RootFrame { get; private set; }

        /// <summary>
        /// Constructor for the Application object.
        /// </summary>
        public App()
        {
            // Global handler for uncaught exceptions. 
            UnhandledException += Application_UnhandledException;

            OverrideTheme();

            // Standard Silverlight initialization
            InitializeComponent();

            // Phone-specific initialization
            InitializePhoneApplication();


            // Show graphics profiling information while debugging.
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // Display the current frame rate counters.
                Application.Current.Host.Settings.EnableFrameRateCounter = true;

                // Show the areas of the app that are being redrawn in each frame.
                //Application.Current.Host.Settings.EnableRedrawRegions = true;

                // Enable non-production analysis visualization mode, 
                // which shows areas of a page that are handed off to GPU with a colored overlay.
                //Application.Current.Host.Settings.EnableCacheVisualization = true;

                // Disable the application idle detection by setting the UserIdleDetectionMode property of the
                // application's PhoneApplicationService object to Disabled.
                // Caution:- Use this under debug mode only. Application that disables user idle detection will continue to run
                // and consume battery power when the user is not using the phone.
                PhoneApplicationService.Current.UserIdleDetectionMode = IdleDetectionMode.Disabled;
            }

        }

        // Code to execute when the application is launching (eg, from Start)
        // This code will not execute when the application is reactivated
        private void Application_Launching(object sender, LaunchingEventArgs e)
        {
        }

        // Code to execute when the application is activated (brought to foreground)
        // This code will not execute when the application is first launched
        private void Application_Activated(object sender, ActivatedEventArgs e)
        {
            // Ensure that application state is restored appropriately
            //if (!App.ViewModel.IsDataLoaded)
            //{
            //    App.ViewModel.LoadData();
            //}
        }

        // Code to execute when the application is deactivated (sent to background)
        // This code will not execute when the application is closing
        private void Application_Deactivated(object sender, DeactivatedEventArgs e)
        {
            // Ensure that required application state is persisted here.
        }

        // Code to execute when the application is closing (eg, user hit Back)
        // This code will not execute when the application is deactivated
        private void Application_Closing(object sender, ClosingEventArgs e)
        {
        }
        
        // Code to execute if a navigation fails
        private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // A navigation has failed; break into the debugger
                System.Diagnostics.Debugger.Break();
            }

            e.Handled = Restart(e.Exception);
        }

        // Code to execute on Unhandled Exceptions
        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {            
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // An unhandled exception has occurred; break into the debugger
                System.Diagnostics.Debugger.Break();
            }

            e.Handled = Restart(e.ExceptionObject);
        }

        private bool Restart(Exception e)
        {
            if (e is QuitException)
                return false;

            while (((Stack<JournalEntry>)RootFrame.BackStack).Count > 0)
                ((Stack<JournalEntry>)RootFrame.BackStack).Pop();

            phoneApplicationInitialized = false;
            InitializePhoneApplication();
            RootFrame.BackKeyPress += new EventHandler<System.ComponentModel.CancelEventArgs>(RootFrame_BackKeyPress);

            return true;
        }

        void RootFrame_BackKeyPress(object sender, System.ComponentModel.CancelEventArgs e)
        {
            if (RootFrame.BackStack.Count() == 0)
                throw new QuitException();
        }

        private void OverrideTheme()
        {
            if (String.Equals(UserSettings.BackgroundColor, "system"))
            {
                ThemeHelper.SetSystemTheme();
            }
            else
            {
                ThemeHelper.SetTheme(UserSettings.BackgroundColor, Theme.ColorsSet.GetColorTitleByIndex(UserSettings.AccentColorIndex));
            }
        }



        #region Phone application initialization

        // Avoid double-initialization
        private bool phoneApplicationInitialized = false;

        // Do not add any additional code to this method
        private void InitializePhoneApplication()
        {
            if (phoneApplicationInitialized)
                return;

            ShowProgressPopup(true);

            // Create the frame 
            RootVisual = RootFrame = new TransitionFrame();
             
            RootFrame.Navigated += CompleteInitializePhoneApplication;

            // Handle navigation failures
            RootFrame.NavigationFailed += RootFrame_NavigationFailed;

            // Ensure we don't initialize again
            phoneApplicationInitialized = true;
        }

        // Do not add any additional code to this method
        private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)
        {
            // Set the root visual to allow the application to render
            if (RootVisual != RootFrame)
                RootVisual = RootFrame;

            // Remove this handler since it is no longer needed
            RootFrame.Navigated -= CompleteInitializePhoneApplication; 

            //HideProgressPopup();
        }

        #endregion

        #region Splash Screen

        private static SplashScreen SplashPopup { get; set; }

        private static Popup CurrentPopup { get; set; }

        public static void ShowProgressPopup(bool isSplash)
        {
            SplashPopup = SplashPopup ?? new SplashScreen();
            SplashPopup.IsSplash = isSplash;
            SplashPopup.IsProgress = true;

            if (CurrentPopup == null)
            {
                CurrentPopup = new Popup();
                CurrentPopup.Child = SplashPopup;               
            }

            CurrentPopup.IsOpen = true;
        }

        public static void HideProgressPopup()
        {
            if (SplashPopup != null)
            {
                SplashPopup.IsSplash = false;
                SplashPopup.IsProgress = false;
            }
        }

        #endregion
    }
}